Contrary to popular belief birth control isn't just to prevent pregnancy. Women use it to regulate their periods. Some women (like myself) can have two periods in a month, some can go a month without having a period. BC also helps prevent very painful ovarian cysts (again, like myself). Ovarian cysts are incredibly painful, I get them and they hurt so bad sometimes that I don't even want to get out of bed. BC also helps endometriosis, a very painful condition that many women face.